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use std::any;
use std::fmt;
use std::fs;
use std::io;
use std::os;
use std::path;
use error;
use resource;
use util;
#[derive(Debug, Eq, PartialEq)]
pub struct File {
path: path::PathBuf,
file_type: FileType,
}
#[derive(Debug, Eq, PartialEq)]
enum FileType {
Absent,
File { contents: Option<Vec<u8>> },
Dir,
Symlink { target: path::PathBuf },
}
impl File {
pub fn at<P>(path: P) -> File
where
P: Into<path::PathBuf>,
{
File {
path: path.into(),
file_type: FileType::File { contents: None },
}
}
pub fn contains<B>(mut self, contents: B) -> File
where
B: Into<Vec<u8>>,
{
self.file_type = FileType::File { contents: Some(contents.into()) };
self
}
pub fn contains_str<S>(self, contents: S) -> File
where
S: Into<String>,
{
self.contains(contents.into().into_bytes())
}
pub fn is_file(mut self) -> File {
self.file_type = FileType::File { contents: None };
self
}
pub fn is_dir(mut self) -> File {
self.file_type = FileType::Dir;
self
}
pub fn points_to<P>(mut self, path: P) -> File
where
P: Into<path::PathBuf>,
{
self.file_type = FileType::Symlink { target: path.into() };
self
}
pub fn is_absent(mut self) -> File {
self.file_type = FileType::Absent;
self
}
}
impl resource::Resource for File {
fn key(&self) -> resource::Key {
resource::Key::Path(self.path.clone())
}
fn realize(&self, &resource::Context { log, .. }: &resource::Context) -> error::Result<()> {
use error::ResultExt;
let path = self.path.to_string_lossy().into_owned();
let log = log.new(o!("path" => path));
match self.file_type {
FileType::Absent => {
if self.path.is_dir() {
trace!(log, "Deleting directory");
fs::remove_dir(&self.path).chain_err(|| {
format!("Failed to delete directory {:?}", self.path)
})?;
}
if self.path.is_file() {
trace!(log, "Deleting file");
fs::remove_file(&self.path).chain_err(|| {
format!("Failed to delete file {:?}", self.path)
})?;
}
}
FileType::File { ref contents } => {
if let Some(ref contents) = *contents {
use std::io::Write;
trace!(log, "Updating file contents");
let mut f = fs::File::create(&self.path).chain_err(|| {
format!("Failed to create file {:?}", self.path)
})?;
f.write_all(contents).chain_err(|| {
format!("Failed to write to file {:?}", self.path)
})?;
}
}
FileType::Dir => {
fs::create_dir_all(&self.path).chain_err(|| {
format!("Failed to create directory {:?}", self.path)
})?;
}
FileType::Symlink { ref target } => {
os::unix::fs::symlink(target, &self.path).chain_err(|| {
format!("Failed to create symlink {:?}", self.path)
})?;
}
}
Ok(())
}
fn verify(&self, &resource::Context { log, .. }: &resource::Context) -> error::Result<bool> {
use error::ResultExt;
let log = log.new(o!("path" => self.path.to_string_lossy().into_owned()));
if !self.path.exists() {
debug!(log, "Path does not exist");
return Ok(false);
}
let metadata = fs::metadata(&self.path).chain_err(|| {
format!("Failed to gather metadata about path {:?}", self.path)
})?;
match self.file_type {
FileType::File { ref contents } => {
if !metadata.file_type().is_file() {
debug!(log, "Path doesn't point to a regular file");
return Ok(false);
}
if let Some(ref contents) = *contents {
let file = fs::File::open(&self.path).chain_err(|| {
format!("Failed to open file {:?} for hashing", self.path)
})?;
let old_sha1 = util::sha1(file)
.chain_err(|| {
format!("Failed to compute SHA-1 digest of file {:?}", self.path)
})?
.to_string();
let new_sha1 = util::sha1(io::Cursor::new(contents))
.chain_err(|| "Failed to compute SHA-1 digest")?
.to_string();
if old_sha1 != new_sha1 {
debug!(log, "File has wrong contents";
"old_sha1" => old_sha1, "new_sha1" => new_sha1);
return Ok(false);
}
}
}
FileType::Dir => {
if !metadata.file_type().is_dir() {
debug!(log, "Path doesn't point to a directory");
return Ok(false);
}
}
FileType::Symlink { target: ref new_target } => {
if !metadata.file_type().is_symlink() {
debug!(log, "Path doesn't point to a symlink");
return Ok(false);
}
let old_target = fs::read_link(&self.path).chain_err(|| {
format!("Failed to read link target of {:?}", self.path)
})?;
if old_target != *new_target {
let old_target = old_target.to_string_lossy().into_owned();
let new_target = new_target.to_string_lossy().into_owned();
debug!(log, "Symlink target is wrong";
"old_target" => old_target, "new_target" => new_target);
return Ok(false);
}
}
FileType::Absent => {}
}
trace!(log, "File is up to date");
Ok(true)
}
fn as_any(&self) -> &any::Any {
self
}
}
impl resource::UnresolvedResource for File {
fn implicit_ensure<E>(&self, ensurer: &mut E)
where
E: resource::Ensurer,
{
if let Some(parent) = self.path.parent() {
ensurer.ensure(File::at(parent).is_dir());
}
}
}
impl fmt::Display for File {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self.file_type {
FileType::Absent { .. } => write!(f, "absent")?,
FileType::File { .. } => write!(f, "file")?,
FileType::Dir { .. } => write!(f, "directory")?,
FileType::Symlink { .. } => write!(f, "symlink")?,
}
write!(f, " {:?}", self.path)?;
match self.file_type {
FileType::File { contents: Some(ref contents) } => {
let sha1 = util::sha1(io::Cursor::new(contents)).unwrap();
write!(f, " with sha1 {}", &format!("{}", sha1)[..8])?
}
FileType::Symlink { ref target } => write!(f, " with target {:?}", target)?,
_ => (),
}
Ok(())
}
}